Home » Public Forums » GMCnet » [GMCnet] Fwd: Gmclist Digest, Vol 9, Issue 26
| [GMCnet] Fwd: Gmclist Digest, Vol 9, Issue 26 [message #39708] |
Tue, 07 April 2009 10:07  |
ldone
Messages: 34
Registered: November 2006
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---------- Forwarded message ----------
From: ldone <ldone1@gmail.com>
Date: Tue, Apr 7, 2009 at 1:06 AM
Subject: Re: Gmclist Digest, Vol 9, Issue 26
To: gmclist@temp.gmcnet.org
Electric Fuel Pump
Can anyone recommend size or model of fuel pump for the 455? She is getting
cranky(not talking about my wife now, hehe) in her old age, loses her prime
if sitting for more than a few days. I heard that an electric fuel booster
will help alleviate that problem.
76 Palm Beach
Louie Diamond
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| Re: [GMCnet] Electric Fuel Pump, was Fwd: Gmclist Digest, Vol 9, Issue 26 [message #39714 is a reply to message #39708] |
Tue, 07 April 2009 11:39  |
Rick Denney
Messages: 430
Registered: January 2004
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ldone writes...
> Can anyone recommend size or model of fuel pump for the 455? She is getting
> cranky(not talking about my wife now, hehe) in her old age, loses her prime
> if sitting for more than a few days. I heard that an electric fuel booster
> will help alleviate that problem.
Louie, the standard electric pump preferred by most is the Carter
4070. It's a good pump--I've had one that has lasted for years--and it
puts out the correct (low, 4-6 psi) pressure for the carb.
Now, how you plumb it in is a big question with lots of options. The
simplest way is to install it on the crossmember in front of the
tanks, and plumb it between the output of the selector valve and the
line going to the engine. That risks filling your crankcase with
gasoline if your mechanical pump's diaphragm fails, but lots of people
do it that way and I've never heard of that theoretical problem
actually occurring. You can prevent that by bypassing the mechanical
pump altogether if you desire, and running the electric pump at all
times when the engine is running. But lots of folks use the electric
pump as a booster pump--if you do that, put a bypass with a check
valve around the electric pump so that the mechanical pump doesn't
have to pull fuel through the electric pump.
And then there are the safety devices to shut the pump down in case of
a crash, or in case the engine stops without the ignition being turned
off. This is probably only needed for an electric pump that replaces
the mechanical pump and runs full time, as opposed to a booster
application. The standard method there is a fuel pump oil-pressure
switch, which will shut down the pump if the oil pressure drops to
zero, but it has a starter bypass so that the pump will run while the
engine is cranking. Get one of those at the same time as the pump.
There are more elaborate ways to convert a system that meet a range of
more elaborate requirements, but that plan will work.
Rick "who runs full-time with an electric pump" Denney
'73 230 Ex-Glacier "Jaws"
Northern Virginia
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'73 Glacier 230 "Jaws"
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| Re: [GMCnet] Electric Fuel Pump, was Fwd: Gmclist Digest, Vol 9, Issue 26 [message #82122 is a reply to message #39714] |
Tue, 27 April 2010 14:34 |
Ken Coit
Messages: 151
Registered: November 2005
Karma: 0
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OK, the new Carter P4070 pump is installed, and the lines don't leak as best
I can tell. However, the pump runs continously which surprised me. I thought
it would shut off once the pressure was built up, but maybe I just don't
understand rotary vane pumps. Nowhere do I find any reference to this
imagined feature nor any complaints that it failed. Does everyone's Carter
4070 run continuously?
Thanks,
Ken
On Tue, Apr 7, 2009 at 12:39 PM, Rick Denney <rick@rickdenney.com> wrote:
> ldone writes...
>
> > Can anyone recommend size or model of fuel pump for the 455? She is
> getting
> > cranky(not talking about my wife now, hehe) in her old age, loses her
> prime
> > if sitting for more than a few days. I heard that an electric fuel
> booster
> > will help alleviate that problem.
>
> Louie, the standard electric pump preferred by most is the Carter
> 4070. It's a good pump--I've had one that has lasted for years--and it
> puts out the correct (low, 4-6 psi) pressure for the carb.
>
> Now, how you plumb it in is a big question with lots of options. The
> simplest way is to install it on the crossmember in front of the
> tanks, and plumb it between the output of the selector valve and the
> line going to the engine. That risks filling your crankcase with
> gasoline if your mechanical pump's diaphragm fails, but lots of people
> do it that way and I've never heard of that theoretical problem
> actually occurring. You can prevent that by bypassing the mechanical
> pump altogether if you desire, and running the electric pump at all
> times when the engine is running. But lots of folks use the electric
> pump as a booster pump--if you do that, put a bypass with a check
> valve around the electric pump so that the mechanical pump doesn't
> have to pull fuel through the electric pump.
>
> And then there are the safety devices to shut the pump down in case of
> a crash, or in case the engine stops without the ignition being turned
> off. This is probably only needed for an electric pump that replaces
> the mechanical pump and runs full time, as opposed to a booster
> application. The standard method there is a fuel pump oil-pressure
> switch, which will shut down the pump if the oil pressure drops to
> zero, but it has a starter bypass so that the pump will run while the
> engine is cranking. Get one of those at the same time as the pump.
>
> There are more elaborate ways to convert a system that meet a range of
> more elaborate requirements, but that plan will work.
>
> Rick "who runs full-time with an electric pump" Denney
>
> '73 230 Ex-Glacier "Jaws"
> Northern Virginia
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Ken Coit, ND7N
Raleigh, NC
Parfait Royale
1978 Royale Rear Bath, 403, 3.07
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| Re: [GMCnet] Electric Fuel Pump, was Fwd: Gmclist Digest, Vol 9, Issue 26 [message #82126 is a reply to message #82122] |
Tue, 27 April 2010 15:14 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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The answer is Yes it runs all the time! There is no high pressure
shutoff.
J.R. Wright
On Apr 27, 2010, at 3:34 PM, Ken Coit wrote:
> OK, the new Carter P4070 pump is installed, and the lines don't leak
> as best
> I can tell. However, the pump runs continuously which surprised me.
> I thought
> it would shut off once the pressure was built up, but maybe I just
> don't
> Understand rotary vane pumps. Nowhere do I find any reference to this
> Imagined feature nor any complaints that it failed. Does everyone's
> Carter
> 4070 run continuously?
>
> Thanks,
>
> Ken
>
>
> On Tue, Apr 7, 2009 at 12:39 PM, Rick Denney <rick@rickdenney.com>
> wrote:
>
>> ldone writes...
>>
>>> Can anyone recommend size or model of fuel pump for the 455? She is
>> getting
>>> cranky(not talking about my wife now, hehe) in her old age, loses
>>> her
>> prime
>>> if sitting for more than a few days. I heard that an electric fuel
>> booster
>>> will help alleviate that problem.
>>
>> Louie, the standard electric pump preferred by most is the Carter
>> 4070. It's a good pump--I've had one that has lasted for years--and
>> it
>> puts out the correct (low, 4-6 psi) pressure for the carb.
>>
>> Now, how you plumb it in is a big question with lots of options. The
>> simplest way is to install it on the crossmember in front of the
>> tanks, and plumb it between the output of the selector valve and the
>> line going to the engine. That risks filling your crankcase with
>> gasoline if your mechanical pump's diaphragm fails, but lots of
>> people
>> do it that way and I've never heard of that theoretical problem
>> actually occurring. You can prevent that by bypassing the mechanical
>> pump altogether if you desire, and running the electric pump at all
>> times when the engine is running. But lots of folks use the electric
>> pump as a booster pump--if you do that, put a bypass with a check
>> valve around the electric pump so that the mechanical pump doesn't
>> have to pull fuel through the electric pump.
>>
>> And then there are the safety devices to shut the pump down in case
>> of
>> a crash, or in case the engine stops without the ignition being
>> turned
>> off. This is probably only needed for an electric pump that replaces
>> the mechanical pump and runs full time, as opposed to a booster
>> application. The standard method there is a fuel pump oil-pressure
>> switch, which will shut down the pump if the oil pressure drops to
>> zero, but it has a starter bypass so that the pump will run while the
>> engine is cranking. Get one of those at the same time as the pump.
>>
>> There are more elaborate ways to convert a system that meet a range
>> of
>> more elaborate requirements, but that plan will work.
>>
>> Rick "who runs full-time with an electric pump" Denney
>>
>> '73 230 Ex-Glacier "Jaws"
>> Northern Virginia
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Ken Coit, ND7N
> Raleigh, NC
> Parfait Royale
> 1978 Royale Rear Bath, 403, 3.07
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Electric Fuel Pump, was Fwd: Gmclist Digest, Vol 9, Issue 26 [message #82136 is a reply to message #82126] |
Tue, 27 April 2010 16:16 |
Ken Coit
Messages: 151
Registered: November 2005
Karma: 0
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Senior Member |
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Thanks JR.
Ken
On Tue, Apr 27, 2010 at 4:14 PM, John Wright <powerjon@chartermi.net> wrote:
> The answer is Yes it runs all the time! There is no high pressure
> shutoff.
>
> J.R. Wright
> On Apr 27, 2010, at 3:34 PM, Ken Coit wrote:
>
> > OK, the new Carter P4070 pump is installed, and the lines don't leak
> > as best
> > I can tell. However, the pump runs continuously which surprised me.
> > I thought
> > it would shut off once the pressure was built up, but maybe I just
> > don't
> > Understand rotary vane pumps. Nowhere do I find any reference to this
> > Imagined feature nor any complaints that it failed. Does everyone's
> > Carter
> > 4070 run continuously?
> >
> > Thanks,
> >
> > Ken
> >
> >
> > On Tue, Apr 7, 2009 at 12:39 PM, Rick Denney <rick@rickdenney.com>
> > wrote:
> >
> >> ldone writes...
> >>
> >>> Can anyone recommend size or model of fuel pump for the 455? She is
> >> getting
> >>> cranky(not talking about my wife now, hehe) in her old age, loses
> >>> her
> >> prime
> >>> if sitting for more than a few days. I heard that an electric fuel
> >> booster
> >>> will help alleviate that problem.
> >>
> >> Louie, the standard electric pump preferred by most is the Carter
> >> 4070. It's a good pump--I've had one that has lasted for years--and
> >> it
> >> puts out the correct (low, 4-6 psi) pressure for the carb.
> >>
> >> Now, how you plumb it in is a big question with lots of options. The
> >> simplest way is to install it on the crossmember in front of the
> >> tanks, and plumb it between the output of the selector valve and the
> >> line going to the engine. That risks filling your crankcase with
> >> gasoline if your mechanical pump's diaphragm fails, but lots of
> >> people
> >> do it that way and I've never heard of that theoretical problem
> >> actually occurring. You can prevent that by bypassing the mechanical
> >> pump altogether if you desire, and running the electric pump at all
> >> times when the engine is running. But lots of folks use the electric
> >> pump as a booster pump--if you do that, put a bypass with a check
> >> valve around the electric pump so that the mechanical pump doesn't
> >> have to pull fuel through the electric pump.
> >>
> >> And then there are the safety devices to shut the pump down in case
> >> of
> >> a crash, or in case the engine stops without the ignition being
> >> turned
> >> off. This is probably only needed for an electric pump that replaces
> >> the mechanical pump and runs full time, as opposed to a booster
> >> application. The standard method there is a fuel pump oil-pressure
> >> switch, which will shut down the pump if the oil pressure drops to
> >> zero, but it has a starter bypass so that the pump will run while the
> >> engine is cranking. Get one of those at the same time as the pump.
> >>
> >> There are more elaborate ways to convert a system that meet a range
> >> of
> >> more elaborate requirements, but that plan will work.
> >>
> >> Rick "who runs full-time with an electric pump" Denney
> >>
> >> '73 230 Ex-Glacier "Jaws"
> >> Northern Virginia
> >>
> >> _______________________________________________
> >> GMCnet mailing list
> >> List Information and Subscription Options:
> >> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >>
> >
> >
> >
> > --
> > Ken Coit, ND7N
> > Raleigh, NC
> > Parfait Royale
> > 1978 Royale Rear Bath, 403, 3.07
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Ken Coit, ND7N
Raleigh, NC
Parfait Royale
1978 Royale Rear Bath, 403, 3.07
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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